Electrically-heated device



J. F. LAMB.

ELECTRICALLY HEATED DEVICE. APPLICATION FILED AUGJL'IQIQ. RENEWED MAY 31.1922.

1 431,468. Patenmd Oct. 10, 1922. v

I N VEN TOR. Jase oh E Lamb hi, ATTORNEY.

Patented Oct. 10, 1922.

UNITED STATES PATENT OFFICE.

megs r. eon-mu sssrenon' ero'nannnns, my a CLLBKCOFW BRITAIN. CONNECTICUT. A. CORPORATION '03 QONNECTIGUT,

E IiEC'IlRIGALLY-HEATED DEVICE.

duplication filed Auzust 11. 1919.;Serial Ho -316,575. 'Rcnewed May 51,1922. Serial No. 564.851;

To attwltomitmay mm: Be it ,known that I, JossrmF. Lane, a citizen of-.tho..United States, and. a resident of NewzBritain, iii-the county of Hart 15 ford, State..of-Connecticut, have invented certain meat and, useful Improvements. in an .Electricallyi-HeatedfDevicm .of-which the following is a specification. inventionrelates ,:genera1.ly,to 9196' tric'ally heated devices land haSlf-p'articular reference to stovesorthelike o the type having a metallic supportingfsurface adapted to receive articles .or .utensils ,to be heated and electrical.,-l1eating means associated with eaid-supportingsurfaccin such manner that, at least, part of theheat generated by the current passingthrough theheating .unit-is-conveyed by. conduction to the su porting surface from which the heatis a so'rbed bv the articleor utensil resting thereon.

The aim of the presenttinvention is to rovide an electricahheater having certain eaturea of novelty and ,advantage, especially in,the construction-and arrangement of the members forming the supporting surface, the construction of the supporting frame therefor, andthe arrangement on manner of mountingthe heating element or elements.

In the accompanying drawing, 1 have shown my invention incorporated in astove as it .is articularly adapted therefor, but it is obvious to those skilled in this art that as certain features oithe invention are applicable for use in electrically heated devices of various kinds and types other thanthat herein illustrated and described.

In the accompanying drawing;

Fig. 1 is a top plan view of a hot plate or stove in which my invention is incorporated.

Fig. 2 is a side elevation thereof, a portion of the casing being broken away.

Fig. 3 is a side view on an enlarged scale,

of one of the studs and its associated insulator, and

Fig. 4 is a sectional view of one of the studs and its associated insulator,

Referring to the drawings in detail, a designates a shell or base having, in the present instance, the form of a pan; 6, a frame located within the shell a; c, studs carried by the frame; :1, electrical insulators carr e oy tne studs, and e, the resistors carried by the insulators.

The baseor shell 0.. which sa termina of sheet metal,;;has its lower portion of re, duced dialmeter to rovide a shoulder 10 onwhich the edge 0 the frame b is adapted to'rest. The construction of the base amay, of course, l e-varied to suit requirements and, f desired, it may be constructed of heat. non-conducting material, such as .mineral: wool, or it may be internally lined with. mice. orother non-conducting material. 4 l v The frame I), for urposes of strength and economy in manu acture, is constructed oi channel iron, it being formed, in the resent illustrative disclosure, of eonverg ingmembers 11 channel shaped in cross section and of such length that their outer ends rest upon the shoulder 10, and ring shaped. channel members 12 concentrically. arranged upon the converging members 11 and secured thereto in any suitable manner, as by means oi: rivets 13 passing through ears extendin outwardly from the lower edges of the c annel members or rings 12. The channel shaped members 11 and 12 are positioned with their channels opening downwardly, that is, with their flanges depending.

The studs .0 with which the insulators d are in contact, are secured in spaced position upon the ringlilre members 12 and have, at their upper ends, enlar ed heads 14, the upper sur aces of which heads are preferably all in the same lane to provide a flat surface on which tlie article to be heated, such as a cooking utensil, flat iron, or the like, is adapted to be laced. For the sake of convenience, the eads 14: of the studs may be referred to as forming collectively a hot plate, this term being used in the sense that it comprises a mass of metal to be heated and from which the heat is to be absorbed by a utensil resting V thereon. The lower ends of the studs are preferably of reduced diameter, and pass through openings in the horizontal webs in the ring-like members 12 and are spread or headed, as shown, to securely hold the studs in place. The shoulder 15 provided on each stud by reducing the lower end thereof, rests about the edge of the opening in the ring-lilce member through, which the the air surrou'ii'cliiigthe' resistors.

reduced end passes so that when a utensil is placed upon the heads 14:, thee-insulators d are relieved er the weight of'the vessel or utensil. The heads 14, it will be noted, g -i g l t iaetiat-thstthe p 0 t large tira'fc 'fi om which the heatmay be absorbed by the utensil resting 1118113011, The members 0 are evident that the construction of these studs may bevaried "without changing "the tune-- tions which they perform,' The insulators d are shown, for illustrativ'epurposes, as; comprising cylindrical bushings encircling the studs c'fb'elow the heads 14 thereof." These electrical insulators are 'fortne'dof a"n1i1terialwhich will readily eo'n'duct heat, and t hey are e'xter nally'grooved t9 receive theres istors s. The resistors 'e, prefera'bl *cof prising coiled wires, are wound un' cr'tnsion-and'in'a zig-za'g fashion-about external surfaces Poi the spaced insulators so that displacemeiit 5f the resistors is uarded against! The resistors may have %he usual terminal posts '1'6 carried by the case a, and in numberand arrangement may, of course, be varied.

It will be seemfrom' the foregoing descriptiohthat ivhen' a device constructed in accordance' with thep'resent invention is in operation, a utensil 'restin up'oii' the heads 14 will bcheatedfin pert; b "the heat-eon ductedfthroiigli the bushin s and studs and, in part, by "radiation of t e heat through i The errangemen t and qons'tructionof my im roved heater suchthat'th heat genera upon passing acurrent of lectr icitfthro h the resistorswill be uniformly iiistribizte' ,the

tendency at all times being for the'heated air'withintbe casing tosct"up air currents carrying the more'he'atedair to cooler portions in tln'=."clevice. present e large surface from it ich the heat is absorbed by the utensil restingl lthereon so that'iv'hen a current is passed r'ou'ghjthe resistor o'r'resistors,"a'fiow'of'heat is im1nedi'ately set up through 'theelec'ti'ical Iheat conducting insulatorsd and studs'c. thermore, as the heatds'drewn away from the surface of the'heads 14, the heat; which niav hate been radiatcdor conducted -to the channel iron members of the frame I) will flow from these members through the studs to the heads. As the resistors are carried by the external surfaces of the spaced 'i n 'sulhtors, part of'the heat evolved at the points of contact between the resistors and the insulators, is radiated so that the bushings are not heated to an excessive degree resulting in damage to, the resistors or'the bushings and requiring a waste of electrical energy.

.The entire device is very simple in construction and the parts may-be quickly ash i oma d n er din, H active yPres nt -Medi s herein referred to as studs: fon purpose of -'cd'nvenienoe.- It is sembled so that the device may be manufactured at arelain'vel low cost. The supporting frame 5 is 'ght in wei 'ht, 'stron and durable and me. be readily removed te a: A 1 5 he lower edges f depe di s fl nge of the cdnvergirig fi'ziine' mem 1 engage the cssc:a,the;amount of heat conducted to the case is at a Such heat as may be convc'gedto the frame either. radiated there rom, or conducted therefrom to the heads 14, so that this-heat is utilized in heat ing the utensil resting upon the heads l t tis, of course, obviousthat iny invention is susceptible of "various modifications and changes which are within the spirit of the invention without departing from the scope of'the following claims, itbeing' understood that the present disclosure of my invention is by way of illustration-only and it is not to be taken as restrictive of my conception. I claim as my invention I 1. In an=electrical heater, a plurality of spaced metallic members the surfaces of which-lie in the same plane to provide a surface for receiving autensil to be heated, a heat conducti 0 electrical insulator for each ofsaid meta lfic members, and a resistor supported by said insulators out of contact with'said metallic members. 2. In an electrical '-'heater, a plurality of spaced metallic members the surfaces of which lie' in the same p'laneto provide a surface for receiving a utensil to be heated, a heat conducti 0 electrical insulator for each ofsaid meta conducting relation thereto, and a resistor supported by said insulators out of contact with said metallic members.

=3."In an "electrical heater, a plurality-of spaced metallic members the surfaces of which are' in the same plane to provide a surface for the reception 'of'a utensil to be eated', a heat conductin electricalinsulator for each of said-mom ers in direct heat ie members in direct heat conducting relation thereto, and a resistor supported by the external surfaces of said insulators out of contact with said spaced metallic members.

4. In an electrical heater, n. plurality'of spaced metallic members the surfaces of which are in the same plane to provide a surface for the reception of a utensil to be heated, a heat comiuctirm electrical insulator for each of said members and in direct heat conducting relation thereto, spacing means therefor, and: a resistor comprising a coiled wire supported thereby out-0f contact with said metallic members, said insulators being spaced a greater distance from each'othcr than the diameter of said heating coil to permitradiation of the heat through out substantially the entire length of said coil.

5. In an electrical heater, a plurality of spaced metallic members the surfaces of which are in the same plane to provide a surface for the reception of a utensil to be heated, a heat conducting electrical insulator for each of said metallic members in direct heat conducting relation thereto, and a resister comprising a coiled Wire supported by the external surfaces of said insulators out of contact with said metallic members, said insulators being spaced a greater distance from each other than the diameter of the heating coil and said coil being wound in a zig-zag manner about said insulators.

5. In an electrical heater, a plurality of spaced metallic members, supporting means therefor, a heat conducting electrical insulator for each of said members and in direct heat conducting relation thereto, said metallic members having heads extending over the tops of said insulators with their top surfaces arranged to provide a supporting surface for a utensil to be heated, and a resistor supported by said insulators out of contact with said metallic members.

7. In an electrical heater, a support, studs arising therefrom and having heads the surfaces of which are disposed to form a surface for the reception of a utensi to be heated, a heat conducting electrical insulater engaging said studs below the heads thereof and a resistor supported by the external surfaces of said insulators.

8. In an electrical heater, a support, studs secured to and arising therefrom and having at their upper ends heads so disposed as to form a surface for the reception of a utensil to be heated, cylindrical bushings about said studs between the support and the heads thereof, and a resistor carried by said bushings.

9. In an electrical heater, a support provided with openings, studs having reduced ends extending through said openings and shoulders seated about the edges of the openings through which the reduced ends pass, a heat conducting electrical insulator positioned against each stud and in heat conduct ing relation thereto with the ends of the studs extending above said insulators to provide a surface for the reception of a utensil to be heated. and a resistor supported by said insulators out of contact with said studs.

10. In an electrical heater, a support having a pluralit of spaced openings, studs having reduce ends extending throu b said openings with their shoulders seate about the edge of the openings, said studs having at their upper end heads arranged to provide a surface for receiving a utensil to be heated, bushings about said studs beneath the heads and resting on said support, and a resistor supported by said bushings.

11. In an electrical heater, a support having a plurality of spaced openings, studs having reduced ends extending iihrou h said openings with their shoulders seated about the edge of the openings, the lower ends of said studs being spread to secure the studs in place, said studs having at their upper end heads arranged to provide a surface for receiving a utensil to be heated, bushings about said studs beneath the heads and resting on said support, and a resistor supported by said bushings.

12. In an electrical heater, a frame comprising a plurality of connected channel iron members, studs carried by said members in spaced relation and the upper ends of which are arranged to form a surface for supporting a utensil to be heated, a bushing associated with each of said studs and in direct heat conducting relation therewith, and a resistor carried by said insulators.

13. In an electrical heater, a resistor frame comprising converging members and ring-like channel members secured to said converging members, insulators carried by said frame, and a resistor carried by said insulators.

14. In an electrical heater, a frame comprising converging channel members having their flanges depending and rings channel-shaped in cross section secured to and having the edges of their flanges resting upon said converging members, insulator spacing members secured to said frame, insulators carried thereby, and a resistor carried by said insulators.

15. In an electrical heater, a case having an internal shoulder, a frame havin converging channel members arranged with their depending flanges resting on the shoulder of said case, studs carried by said frame, insulators carried by said studs, and a resistor carried by said insulators.

JOSEPH F. LAMB. 

